Improved selectivity and decreased formation of overoxygenated byproducts were achieved by using a MeCN/H2O biphasic system for the iron‐catalyzed oxidation of benzene to phenol with H2O2. Under optimized reaction conditions with 5‐carboxy‐2‐methylpyrazine‐N‐oxide as the ligand for iron [Eq. (1)] a benzene conversion of 8.6 % and selectivities based on benzene and H2O2 of 97 and 88 %, respectively, were obtained.
Auf den Punkt gebracht: Der Zeolithkatalysator TS‐1B für die Oxidation von Benzol mit Wasserstoffperoxid wird durch Modifizierung von Titan‐Silicalit mit NH4HF2 und H2O2 erhalten. In Gegenwart von Sulfolan bleibt die Oxidation mit diesem neuen Katalysator selektiv auf der Stufe von Phenol stehen (siehe Schema).
The hydroxylation of benzene to phenol with hydrogen peroxide was investigated using different solvents and a series of catalysts, obtained by modification of titanium silicalite (TS-1). The best results were obtained after post-synthesis treatment of TS-1 with NH 4 HF 2 and H 2 O 2 . The new catalyst (TS-1B), used in the presence of a particular co-solvent (sulfolane) is able to protect the produced phenol from over-oxidation and dramatically enhanced the selectivity of the reaction.
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